Effects of precommercial thinning intensity on growth of Fagus orientalis Lipsky stands over 6 years


JOURNAL OF FORESTRY RESEARCH, vol.33, no.3, pp.937-947, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 3
  • Publication Date: 2022
  • Doi Number: 10.1007/s11676-021-01396-8
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Agricultural & Environmental Science Database, BIOSIS, CAB Abstracts, Geobase, Veterinary Science Database
  • Page Numbers: pp.937-947
  • Keywords: Tending operation, Stand development, Precommercial thinning, Thicket stage, YOUNG LODGEPOLE PINE, BALSAM FIR, SYLVATICA L., SCOTS PINE, NORWAY SPRUCE, NEW-BRUNSWICK, JACK PINE, SYLVESTRIS, TREE, DENSITY
  • Karadeniz Technical University Affiliated: Yes


Determining the most suitable intensities for precommercial thinning (PCT) in oriental beech (Fagus orientalis) stands, which cover substantial areas in Turkey and have a high economic and ecological value, is essential to provide higher economic return and obtain well-formed stems. The effects of various rates of PCT interventions on the growth characteristics of natural stands, located in the northern part of Turkey, were explored to determine appropriate thinning rates; 24 experimental PCT plots (4 PCT rates x 3 replications x 2 sites) were established in young thicket-stage stands and four precommercial thinning rates such as light (1 - 1.5 m spacing), moderate (1.5-2.0 m spacing) and heavy (2.5-3.0 m spacing) thinning, including a control plot (i.e., untreated), were applied. At the end of the 2007 and 2010 growing seasons, the diameter and height of the trees were measured and growth analyzed based on the 3-year and 6-year incremental growth. PCT levels were found to have significant (P < 0.05) effects on diameter, height, total basal area and total volume increment at the end of each period. The mean diameter and height increment proportionally increased with increasing PCT intensity in the third and the sixth year. In both sites, the moderate PCT provided the greatest total basal area and total volume increment. The early results indicate that the moderate PCT (1.5-2 m spacing) boosted stand development over time.